This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/16.1/containerfile/suse/kiosk/firefox-esr:140.10
  docker pull registry.opensuse.org/devel/bci/16.1/containerfile/suse/kiosk/firefox-esr:140.10-43.11
  docker pull registry.opensuse.org/devel/bci/16.1/containerfile/suse/kiosk/firefox-esr:esr

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.